358 CLAVICORNIA — TRICHOPTEKYGIDAE. 



Eed-brown, shiny ; elytra gradually red-yellow toward 

 apex ; antennae brownish, with yellow base, legs reddish- 

 yellow. Broader tlian S. assimilis, with shorter thorax. 

 L. 1 1. Common. *S'. holeti, Panz. 



TllICIIOJP TER YGIDA E, 



A, Elytra much abbreviated. 



a. Intermediate coxae contiguous. 



J, Thorax bi'oadest before middle, sides sinuate 

 toward base ; abdomen with six ventral segments. 



Mesosternum not ridged ; metasternum not produced 

 between coxae; posterior coxae placed far apart; maxillary 

 palpi with last joint bisinuate and curved, third joint 

 much thickened and longer than Ijroad, nearly as broad 

 at apex as in middle, second joint thickened at apex. 



Ptinclla, Mots. 



II, Thorax broadest at or near base, sides not sinuate; 

 abdomen with seven ventral segments. 



1. Posterior angles of thorax not produced. 



Mesosternum with a very sliort ridge, not interposed 

 between coxae ; metasternum widely produced between 

 coxae ; posterior coxae placed ratlier far apart ; maxillary 

 palpi with last joint strongly curved, third joint much 

 thickened, as broad as long, nearly as wide at apex as in 

 middle, second joint slightly thickened at base and apex. 



rteryx, Mat. 



2, Posterior angles of thorax produced. 



Mesosternum with a short ridge, epimera inflexed far and 

 widely beneath ; metasternum produced far and broadly 

 between coxae, with a long, sharp tooth on each side; pos- 

 terior coxae placed far apart, much dilated ; niaxillaiy 

 palpi with last joint divided into two portions, apical 

 portion thin, slightly curved at apex, basal portion strongly 

 dilated, third joint much thickened, longer tlian l)road, 

 nearly as wide at apex as in middle, second joint nearly 

 cylindrical. Actinopteryx, Mat. 



b. Intermediate coxae not contiguous ; abdomen with 

 six ventral segments. 



I, Thorax not narrowed behind. 



Mesosternum ridged, epimera moderately inflexed be- 



